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Doping effect on the phase transition temperature in ferroelectric SrBi 2− x Nd x Nb 2 O 9 layer‐structured ceramics: a micro‐Raman scattering study
Author(s) -
Jiang Kai,
Li Wenwu,
Chen Xiangui,
Zhan Zhenni,
Sun Lin,
Hu Zhigao,
Chu Junhao
Publication year - 2012
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.3075
Subject(s) - ferroelectricity , raman spectroscopy , octahedron , phonon , phase transition , natural bond orbital , atmospheric temperature range , materials science , analytical chemistry (journal) , phase (matter) , crystallography , transition temperature , mineralogy , condensed matter physics , chemistry , dielectric , crystal structure , optics , physics , thermodynamics , density functional theory , computational chemistry , optoelectronics , organic chemistry , chromatography , superconductivity
The temperature dependence of Raman spectra for SrBi 2− x Nd x Nb 2 O 9 ceramics ( x from 0 to 0.2) has been studied in a wide temperature range from 80 to 873 K. It is found that the peak position of the A 1 g [Nb] phonon mode at 207 cm –1 , which is directly associated with the distortion of NbO 6 octahedron, decreases with increasing Nd composition, while the A 1 g [O] phonon mode at 835 cm –1 increases. Moreover, both the peak position and intensity of the A 1 g [Nb] phonon mode reveal strong anomalies around the ferroelectric to paraelectric phase transition temperature. It indicates that the phase transition temperature decreases from about 710 to 550 K with increasing Nd composition, which is due to the fact that the introduction of Nd ions in the Bi 2 O 2 layers reduces the distortion extent of NbO 6 octahedron. Copyright © 2011 John Wiley & Sons, Ltd.